ATxmega256A3U Atmel Corporation, ATxmega256A3U Datasheet - Page 28

• Manufacturer Part Number: ATxmega256A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3U

• Flash (kbytes): 256 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 50
• Ext Interrupts: 50
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

15. I/O Ports
15.1
15.2
8386A–AVR–07/11
Features
Overview
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One port consists of up to 8 pins ranging from pin 0 to 7. Each port pin can be configured as
input or output with configurable driver and pull settings. They also implement synchronous and
asynchronous input sensing with interrupts and events for selectable pin change conditions.
Asynchronous pin-change sensing means that a pin change can wake the device from all sleep
modes, included the modes where no clocks are running.
All functions are individual and configurable per pin, but several pins can be configured in one
single operation. The pins have hardware Read-Modify-Write (RMW) functionality for safe and
correct change of drive value and/or pull resistor configuration. The direction of one port pin can
be changed without unintentionally changing the direction of any other pin.
The port pin configuration also controls input and output selection of other device function. It is
possible to have both the peripheral clock and the real time clock output to a port pin, and avail-
able for external use. The same applies to events from the Event System that can be used to
synchronize and control external functions. Other digital peripherals such as USART, SPI and
Timer/Counters can be remapped to selectable pin location in order to optimize pinout versus
application needs.
General purpose input and output pins with several and individual configuration options
Output driver with configurable driver and pull settings:
Input with synchronous and/or asynchronous sensing with port interrupts and events
Optimal pull-up and pull-down resistor on input and Wired-OR/AND configurations
Optional slew rate control
Asynchronous pin change sensing that can wake-up the device from all sleep modes
Two port interrupts with pin masking per I/O port
Efficient and safe access to port pins
Peripheral Clocks output on port pin
Real Time Counter Clock output to port pin
Event Channel output on port pin
Remap of digital peripheral pin functions
– Totem-pole
– Wired-AND
– Wired-OR
– Bus-keeper
– Inverted I/O
– Sense both edges
– Sense rising edges
– Sense falling edges
– Sense low level
– Hardware read-modify-write through dedicated Toggle/Clear/Set registers
– Configuration of multiple pins in a single operation
– Mapping of port registers into bit-accessible I/O memory space
– Selectable USART, SPI and Timer/Counter input/output pin locations
XMEGA A3U
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